Cirtabaal, Archdemon of Wrath

Whenever an opponent discards one or more
cards, you may draw a card.
{x}{b}: Deal X damage to any target. If the target is
a player, this ability costs an additional {b}{b}.
{b}{b}: Until end of turn, whenever target
opponent loses life they must discard a card.
{2}{b}{b}{p/b}{p/b}: Destroy all creatures. For each
creature destroyed this way, target opponent loses
1 life.